Instruction Manual
Microprocessor Temperature Regulator HT MC11
Page 10 of 22
Ramp Function:
A programmed ramp is active when the setpoint has been changed or when mains
supply is switched on. The ramp starts at the actual process value and ends at the
adjusted setpoint.
S P / # Ramp rising OF F ; 0.1 … 100.0 °C/min
S P / % Ramp falling OF F ; 0.1 … 100.0 °C/min
Softstart Function (General Description):
For slow drying of heating elements with magnesium oxide (ceramic) insulation (e.g.
high-performance cartridge heaters), the heating output of the regulator is limited
to a preselectable ratio value during start-up.
The switching frequency is increased by a factor of 4 (selected switching cycle time is
divided by 4) for slower and more uniform heating-up.
Once the process value reaches the softstart setpoint, the temperature is kept con-
stant for a preselectable duration time. At the end of this period the temperature
rises to the adjusted setpoint.
When softstart function is active, the autotune function is not available (error mes-
sage: Er . O P ).
If a setpoint ramp is programmed, softstart has priority and the ramp function is not
active during softstart.
Parameters for softstart function are only available if parameter P (xp) is > 0.1 %
(adjustment in parameter level).
Softstart function only starts if the process value is lower than the softstart setpoint
when switching on the regulator.
Version 1080/1.03 02/2018
471 10 1400
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